\begin{table}[htbp]\centering
\caption{Robust IV Estimates of Log Registration on Log Registrations on Log VMT \label{tab:VMTiv}}
\begin{tabular}{l*{4}{c}}
\hline \hline \multicolumn{5}{l}{\textit{Panel A: IV Estimates and Robust 95\% Confidence Intervals}} \\&            &            &            &            \\
\multicolumn{5}{c}{Dep. Var.: Log Number of Vehicle Registrations} \\ &         (1)&         (2)&         (3)&         (4)\\
$\beta$     &      -0.217&       -0.21&       -0.30&       -0.23\\
95\% Conf. Set&[-1.19, 0.44]&[-1.19, 0.43]&[-3.70, 0.76]&(-$\infty$, $\infty$)\\
\makecell[l]{Data Source \nextline Controls}&        None&  Documented&\makecell{Large \nextline Undocumented}&\makecell{Small \nextline Undocumented}\\
State Fixed Effects&           Y&           Y&           Y&           Y\\
Year Fixed Effects&           Y&           Y&           Y&           Y\\
\makecell[l]{State-Specific Linear \\ Time Trends}&           Y&           Y&           Y&           Y\\
Common Controls&           Y&           Y&           Y&           Y\\
Number of Obs.&       2,424&       2,424&       2,424&       2,424\\
\hline \hline \multicolumn{5}{l}{\textit{Panel B: Anderson-Robin Test Statistics and P-Values}} \\&            &            &            &            \\
\multicolumn{5}{c}{\underline{$ H_{0}:\beta=1.6$}} \\ AR Stat&   11.601***&   12.041***&     6.532**&       2.668\\
p-value     &       0.001&       0.001&       0.011&       0.102\\
            &            &            &            &            \\
\multicolumn{5}{c}{\underline{$ H_{0}:\beta=1$}} \\ AR Stat&    8.774***&    9.206***&     4.961**&       1.981\\
p-value     &       0.003&       0.002&       0.026&       0.159\\
            &            &            &            &            \\
\multicolumn{5}{c}{\underline{$ H_{0}:\beta=0.3$}} \\ AR Stat&       2.468&       2.556&       1.436&       0.569\\
p-value     &       0.116&       0.110&       0.231&       0.451\\
            &            &            &            &            \\
\multicolumn{5}{c}{\underline{$ H_{0}:\beta=0$}} \\ AR Stat&       0.440&       0.436&       0.342&       0.108\\
p-value     &       0.507&       0.509&       0.559&       0.742\\
            &            &            &            &            \\
\multicolumn{5}{c}{\underline{$ H_{0}:\beta=-2.5$}} \\ AR Stat&    7.805***&    7.699***&      3.028*&       1.983\\
p-value     &       0.005&       0.006&       0.082&       0.159\\
\hline \hline \end{tabular} \vspace{0.2cm} \begin{tablenotes} \begin{spacing}{0} \begin{footnotesize} \item \textbf{Notes:} The top panel of this table presents IV estimates and 95\% confidence sets robust to weak instruments of the linear relationship between log vehicle-miles travelled (VMT) and log vehicle registrations.  The bottom panel presents Anderson-Rubin chi-squared statistics along with p-values for different null hypotheses pertaining to the parameter estimated in the top panel.  The unit of observation is state-year.  All regressions include state fixed effects, year fixed effects and state-specific linear time trends. The four specifications pertaining to different levels of  (DSCs) and control specifications are documented in Table \cref{ssec:Spec}. Confidence sets are based on standard errors clustered by state. * p\textless 0.1, ** p\textless 0.05, *** p\textless 0.01 \end{footnotesize} \end{spacing} \end{tablenotes} \end{table}
